Food Preservation
Food Preservation
Food Preservation: Food items are prone to spoilage by microorganisms, there are methods by which food can be preserved for a longer time. Food preservation is the process of treating and handling food with an aim to stop or slow down its spoilage while maintaining its nutritional value, texture, and flavour. Since microorganisms are one of the major causes of food spoilage, food preservation involves creating conditions unfavorable for their growth. Food preservation methods either kill microbes or prevent their reproduction.
Different methods of food preservation and how it preserves food
Boiling: Boiling liquid food items can kill any existing microbes. Milk and water are often boiled to kill any harmful microbes that may be present in them.
Dehydration: Dehydration involves removal of water, one of the key requirements for microbial growth, from food items. Food items like cereals and pulses are generally dried under the sun to remove the moisture present in them.
Refrigeration and Freezing: Refrigeration at low temperatures and freezing help to preserve food for a longer time because microbes like bacteria and fungi cannot thrive at low temperatures. When fresh fruits and vegetables are frozen, water present in them also freezes. This helps in preventing microbial reproduction. Food items that can be preserved by freezing include meat and vegetable.
Canning: Storing food items in airtight cans is an effective way of preserving them. Food items like jams, vegetables, fish, and even cooked food are canned and sold in the market.
Using Chemical Preservatives: Any substance that helps preserve food or any other item is known as a preservative. Many chemicals help control microbial growth and are used as preservatives. Examples of chemical preservatives are sodium benzoate and potassium metabisulphite. These preservatives are used in squashes, sherbets, and ketchups.
Using salt sugar, oil, or vinegar: Salt, sugar, oil, and vinegar create an environment that prevents microbial growth, and are, therefore, used for preserving foodstuffs like meat pickles, jams, jellies, and vegetables. In addition to preserving foodstuffs, these substances also impart flavour to them.
Pasteurization: Pasteurization involves heating a foodstuff to a high temperature and then cooling it rapidly. This helps in destroying harmful microbes without changing the composition, flavour, or nutritive value of the foodstuff. This process is named after the French chemist Louis Pasteur, who discovered it in the 19th century. Commercially available milk is first heated to a high temperature for about half a minute and then cooled rapidly. It is then stored at temperatures lower than 10°C.
Which of the following are commonly used as food preservatives ? | |||
| Right Option : D | |||
| View Explanation | |||
Vinegar is used in the preparation of pickles because it ____________________. | |||
| Right Option : A | |||
| View Explanation | |||
The common preservative which reduces the moisture content to inhibit the growth of bacteria is : | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [20]
When I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
Sharandeep Singh
7thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
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10thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
Aman Kumar Shrivastava
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Om Umang
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Shivam Rana
7thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
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Cheshta
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7thWe started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
Manya
8thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
